Used with
permission of Maiken Naylor, University at Buffalo, Buffalo, NY, USA,
http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps
..Archimedes
..Heike Kamerlingh
Onnes
..Blaise Pascal
..K. E. Tsiolkovsky
..Christian
Doppler
..Leon Foucault
..Democritus
..Otto von Guericke..Evangelista
Torricelli
..Robert Boyle